Log environment variable keys at startup (#18125)

* Log environment variable keys at startup

* run make fmt

* change name

* add changelog

* fix changelog nubmer

* fix title

* add test

* fix message

* Update changelog/18125.txt

Co-authored-by: Jason O'Donnell <2160810+jasonodonnell@users.noreply.github.com>

* add trace test

* remove check for >= debug, trace

* Update changelog/18125.txt

Co-authored-by: Jason O'Donnell <2160810+jasonodonnell@users.noreply.github.com>

Co-authored-by: Jason O'Donnell <2160810+jasonodonnell@users.noreply.github.com>

changelog/18125.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+command/server: Environment variable keys are now logged at startup.
+```

command/server.go

@@ -1168,6 +1168,21 @@ func (c *ServerCommand) Run(args []string) int {
 	info := make(map[string]string)
 	info["log level"] = config.LogLevel
 	infoKeys = append(infoKeys, "log level")
+
+	// returns a slice of env vars formatted as "key=value"
+	envVars := os.Environ()
+	var envVarKeys []string
+	for _, v := range envVars {
+		splitEnvVars := strings.Split(v, "=")
+		envVarKeys = append(envVarKeys, splitEnvVars[0])
+	}
+
+	sort.Strings(envVarKeys)
+
+	key := "environment variables"
+	info[key] = strings.Join(envVarKeys, ", ")
+	infoKeys = append(infoKeys, key)
+
 	barrierSeal, barrierWrapper, unwrapSeal, seals, sealConfigError, err := setSeal(c, config, infoKeys, info)
 	// Check error here
 	if err != nil {

command/server_test.go

@@ -203,63 +203,70 @@ func TestServer(t *testing.T) {
 		contents string
 		exp      string
 		code     int
-		flag     string
+		args     []string
 	}{
 		{
 			"common_ha",
 			testBaseHCL(t, "") + inmemHCL,
 			"(HA available)",
 			0,
-			"-test-verify-only",
+			[]string{"-test-verify-only"},
 		},
 		{
 			"separate_ha",
 			testBaseHCL(t, "") + inmemHCL + haInmemHCL,
 			"HA Storage:",
 			0,
-			"-test-verify-only",
+			[]string{"-test-verify-only"},
 		},
 		{
 			"bad_separate_ha",
 			testBaseHCL(t, "") + inmemHCL + badHAInmemHCL,
 			"Specified HA storage does not support HA",
 			1,
-			"-test-verify-only",
+			[]string{"-test-verify-only"},
 		},
 		{
 			"good_listener_timeout_config",
 			testBaseHCL(t, goodListenerTimeouts) + inmemHCL,
 			"",
 			0,
-			"-test-server-config",
+			[]string{"-test-server-config"},
 		},
 		{
 			"bad_listener_read_header_timeout_config",
 			testBaseHCL(t, badListenerReadHeaderTimeout) + inmemHCL,
 			"unknown unit \"km\" in duration \"12km\"",
 			1,
-			"-test-server-config",
+			[]string{"-test-server-config"},
 		},
 		{
 			"bad_listener_read_timeout_config",
 			testBaseHCL(t, badListenerReadTimeout) + inmemHCL,
 			"unknown unit \"\\xe6\\x97\\xa5\" in duration",
 			1,
-			"-test-server-config",
+			[]string{"-test-server-config"},
 		},
 		{
 			"bad_listener_write_timeout_config",
 			testBaseHCL(t, badListenerWriteTimeout) + inmemHCL,
 			"unknown unit \"lbs\" in duration \"56lbs\"",
 			1,
-			"-test-server-config",
+			[]string{"-test-server-config"},
 		},
 		{
 			"bad_listener_idle_timeout_config",
 			testBaseHCL(t, badListenerIdleTimeout) + inmemHCL,
 			"unknown unit \"gophers\" in duration \"78gophers\"",
 			1,
-			"-test-server-config",
+			[]string{"-test-server-config"},
+		},
+		{
+			"environment_variables_logged",
+			testBaseHCL(t, "") + inmemHCL,
+			"Environment Variables",
+			0,
+			[]string{"-test-verify-only"},
 		},
 	}
 
@@ -278,11 +285,11 @@ func TestServer(t *testing.T) {
 			f.Close()
 			defer os.Remove(f.Name())
 
-			code := cmd.Run([]string{
-				"-config", f.Name(),
-				tc.flag,
-			})
+			args := append(tc.args, "-config", f.Name())
+
+			code := cmd.Run(args)
 			output := ui.ErrorWriter.String() + ui.OutputWriter.String()
+
 			if code != tc.code {
 				t.Errorf("expected %d to be %d: %s", code, tc.code, output)
 			}